{
  "manageEntity": {
    "action": "Save",
    "entityId": "420918",
    "entityType": "Track",
    "nonce": "0xa355b4cffebb8dbdb0ccf35421a447cc55101d3b2b5947501eb767c981f7bc0e",
    "signature": "0x4a4f41d0229dd3648b8fd10df2218d11ed4f9de8ddb3e9a72257ab74f2a7f1e26d3c6aa2605ce200b81c82c324e965463b3994ab036ba9ef42c138b8d23722101c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}